Thanks for writing. Without being able to see your rose in person, I can't say exactly what's going on...this free service rally isn't meant for diagnosing plant problems like this where an exmination of the plant is necessary.
That said, pale rose leaves may develop from virus diseases (to which there's no cure and the plant should be removed and thrown in the trash to prevent the virus from spreading), poor soil nutrition, powdery mildew (which starts as a grey or silvery powder on leaf surfaces and eventually turns them yellow), and black spot (which turns leaves yellow with black spots).
---Justin, Senior Garden Editor, BHG.com
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